Update index.html
Update index.html

According to the SMTPAPI validator (https://sendgrid.com/docs/API_Reference/SMTP_API/smtpapi_validator.html), the above example is invalid. Fixing it to use the expected list form.
bogdanboss/docs,Whatthefoxsays/docs,Ranhiru/docs,hardikjain29/docs,L2G/docs,jacobmovingfwd/docs,taz77/docs,hardikjain29/docs,Zaftula/docs,L2G/docs,taz77/docs,sendgrid/docs,katieporter/docs,katieporter/docs,taz77/docs,GilUpstream/docs,taz77/docs,ksigler7/docs,Ranhiru/docs,GilUpstream/docs,Whatthefoxsays/docs,Ranhiru/docs,Ranhiru/docs,bogdanboss/docs,jacobmovingfwd/docs,GilUpstream/docs,awwa/docs,Aonepathan/docs,ksigler7/docs,Whatthefoxsays/docs,hardikjain29/docs,awwa/docs,awwa/docs,sendgrid/docs,Zaftula/docs,Aonepathan/docs,katieporter/docs,jacobmovingfwd/docs,jacobmovingfwd/docs,awwa/docs,Aonepathan/docs,bogdanboss/docs,katieporter/docs,bogdanboss/docs,hardikjain29/docs,bogdanboss/docs,Ranhiru/docs,jacobmovingfwd/docs,L2G/docs,Aonepathan/docs,awwa/docs,L2G/docs,Zaftula/docs,sendgrid/docs,Zaftula/docs,Zaftula/docs,Aonepathan/docs,GilUpstream/docs,katieporter/docs,taz77/docs,GilUpstream/docs,hardikjain29/docs,ksigler7/docs,L2G/docs